1. University of Liverpool, Department of Chemistry, Liverpool L69 3BX, U.K.
2. Lappeenranta University of Technology, Department of Mathematics and Physics,
Lappeenranta 53851, Finland
3. University of Liverpool, Department of Physics, Liverpool L69 3BX, U.K.
4. School of Chemistry, University of Manchester, Oxford Road, Manchester,
M13 9PL, U.K.